1 //===----------------------------------------------------------------------===// 2 // 3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. 4 // See https://llvm.org/LICENSE.txt for license information. 5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception 6 // 7 //===----------------------------------------------------------------------===// 8 9 #ifndef _LIBCPP___ALGORITHM_RANGES_SAMPLE_H 10 #define _LIBCPP___ALGORITHM_RANGES_SAMPLE_H 11 12 #include <__algorithm/iterator_operations.h> 13 #include <__algorithm/sample.h> 14 #include <__algorithm/uniform_random_bit_generator_adaptor.h> 15 #include <__config> 16 #include <__iterator/concepts.h> 17 #include <__iterator/incrementable_traits.h> 18 #include <__iterator/iterator_traits.h> 19 #include <__random/uniform_random_bit_generator.h> 20 #include <__ranges/access.h> 21 #include <__ranges/concepts.h> 22 #include <__type_traits/remove_reference.h> 23 #include <__utility/forward.h> 24 #include <__utility/move.h> 25 26 #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) 27 # pragma GCC system_header 28 #endif 29 30 #if _LIBCPP_STD_VER >= 20 31 32 _LIBCPP_BEGIN_NAMESPACE_STD 33 34 namespace ranges { 35 namespace __sample { 36 37 struct __fn { 38 template <input_iterator _Iter, sentinel_for<_Iter> _Sent, weakly_incrementable _OutIter, class _Gen> 39 requires(forward_iterator<_Iter> || random_access_iterator<_OutIter>) && indirectly_copyable<_Iter, _OutIter> && 40 uniform_random_bit_generator<remove_reference_t<_Gen>> 41 _LIBCPP_HIDE_FROM_ABI _OutIter 42 operator()(_Iter __first, _Sent __last, _OutIter __out_first, iter_difference_t<_Iter> __n, _Gen&& __gen) const { 43 _ClassicGenAdaptor<_Gen> __adapted_gen(__gen); 44 return std::__sample<_RangeAlgPolicy>( 45 std::move(__first), std::move(__last), std::move(__out_first), __n, __adapted_gen); 46 } 47 48 template <input_range _Range, weakly_incrementable _OutIter, class _Gen> 49 requires(forward_range<_Range> || random_access_iterator<_OutIter>) && 50 indirectly_copyable<iterator_t<_Range>, _OutIter> && uniform_random_bit_generator<remove_reference_t<_Gen>> 51 _LIBCPP_HIDE_FROM_ABI _OutIter 52 operator()(_Range&& __range, _OutIter __out_first, range_difference_t<_Range> __n, _Gen&& __gen) const { 53 return (*this)( 54 ranges::begin(__range), ranges::end(__range), std::move(__out_first), __n, std::forward<_Gen>(__gen)); 55 } 56 }; 57 58 } // namespace __sample 59 60 inline namespace __cpo { 61 inline constexpr auto sample = __sample::__fn{}; 62 } // namespace __cpo 63 } // namespace ranges 64 65 _LIBCPP_END_NAMESPACE_STD 66 67 #endif // _LIBCPP_STD_VER >= 20 68 69 #endif // _LIBCPP___ALGORITHM_RANGES_SAMPLE_H 70